/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlinePurchaseInterface.h
Get list of cached receipts for user (includes transactions currently being processed)
void GetReceipts ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & UserId, [TArray](API\Runtime\Core\Containers\TArray)< [FPurchaseReceipt](API\Plugins\OnlineSubsystem\Interfaces\FPurchaseReceipt) > & OutReceipts ) const